1943, England: On a foggy night during the blackout, 25-year-old May Robinson watches in horror as her mother, Ivy, is tragically killed. Heartbroken, May is not sure she has the strength to harbour the secret she has kept for so many years – a secret that her mother devoted her life to hiding, and that would tear their broken family even further apart. Vowing to make her mother proud, May trains to be a nurse at the local hospital, against a backdrop of wailing air-raid sirens and the eternal drone of enemy planes. Tending to wounded, ashen-faced soldiers and fighting to save lives, May encounters Richard Bentley, who works at the hospital. But why isn’t he fighting in the war like thousands of other brave young men? In the darkest of days, amongst death and despair, May and Richard are beacons of hope for one another. But in a perilous time of such uncertainty, and as each longs to escape their past, how well do they really know each other? And when the shocking truth of May’s secret comes to light, can their love survive the impossible?